Heat Transfer

Question: Air refrigeration cycle is used in [A]. commercial refrigerators [B]. domestic refrigerators [C]. air-conditioning [D]. gas liquefaction Answer: Option D Explanation: No answer description available for this question.

Question: Bell-Coleman cycle is a [A]. reversed Carnot cycle [B]. reversed Otto cycle [C]. reversed Joule cycle [D]. reversed Rankine cycle Answer: Option C Explanation: No answer description available for this question.

Question: Air refrigerator works on [A]. reversed Carnot cycle [B]. Bell Coleman cycle [C]. both (a) and ib) [D]. none of these Answer: Option C Explanation: No answer description available for this question.

Question: In figure shown, E is a heat engine with efficiency of 0.4 and R is a refrigerator. It is given that Q2 + Q4 = 3Q1. The C.O.P. of the refrigerator is [A]. 2.5 [B]. 3.0 [C]. 4.0 [D]. 5.0 Answer: Option D Explanation: No answer description available for this question.

Question: A reversible engine has ideal thermal efficiency of 30%. When it is used as a refrigerating machine with all other conditions unchanged, the coefficient of performance will be [A]. 1.33 [B]. 2.33 [C]. 3.33 [D]. 4.33 Answer: Option B Explanation: No answer description available for this question.

Question: A refrigerating system operating on reversed Brayton refrigeration cycle is used for maintaining 250 K. If the temperature at the end of constant pressure cooling is 300 K and rise in the temperature of air in the refrigerator is 50 K, then the net work of compression will be (assume air as working substance…

Question: A heat pump working on a reversed Carnot cycle has a C.O.P. of 5. It works as a refrigerator taking 1 kW of work input. The refrigerating effect will be [A]. 1 kW [B]. 2 kW [C]. 3 kW [D]. 4 kW Answer: Option D Explanation: No answer description available for this question.

Question: Which of the following represents a heat pump? [A]. [B]. [C]. [D]. Answer: Option B Explanation: No answer description available for this question.

Question: A condenser of refrigeration system rejects heat at the rate of 120 kW, while its compressor consumes a power of 30 kW. The coefficient of performance of the system will be [A]. 1/4 [B]. 1/3 [C]. 3 [D]. 4 Answer: Option D Explanation: No answer description available for this question.

Question: The capacity of a domestic refrigerator is in the range of [A]. 0.1 to 0.3 TR [B]. 1 to 3 TR [C]. 3 to 5 TR [D]. 5 to 7 TR Answer: Option A Explanation: No answer description available for this question.